Speculative Actions

exit()

void exit(int status)

The exit() action is used to immediately stop tracing, and to inform the
DTrace consumer that it should cease tracing, perform any final processing, and call
exit(3C) with the status specified. Because exit() returns a status to user-level, it is
a data recording action, However, unlike other data storing actions, exit() cannot be
speculatively traced. exit() will cause the DTrace consumer to exit regardless of
buffer policy. Because exit() is a data recording action, it can be dropped.

When exit() is called, only DTrace actions already in progress on other CPUs
will be completed. No new actions will occur on any CPU. The only
exception to this rule is the processing of the END probe, which will
be called after the DTrace consumer has processed the exit() action and indicated
that tracing should stop.